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HomePasture HealthForageFear of Bloat Costs More Money Than Actual Cases of Bloat

Fear of Bloat Costs More Money Than Actual Cases of Bloat

High protein forage can increase rates of gain, benefit soil

Respect it, but don’t fear it. That’s the message from cattle producers and beef specialists alike who through years of experience and research appreciate the value of grazing cattle on pure or percentage stands of alfalfa.

Properly managed alfalfa makes good pasture with several added benefits, including:

• Improved weight gains on all classes of cattle (gains of 1.5 to 2 or more pounds per day can be expected);
• Adding fertility to the soil with a nitrogen-fixing crop;
• Creating a hedge against poor forage production during dryer growing seasons; and
• Increasing plant biodiversity to benefit soil health.

Yes, there are circumstances when turning cattle into a lush stand of alfalfa at the wrong time and perhaps with the wrong class of cattle can result in bloat. But paying attention to a few production and management principles can greatly reduce the risk of bloat and provide the opportunity to capture the benefits.

While pure stands of alfalfa pasture can be very productive, they may be more appropriate for end use as high quality hay or silage for dairy cattle. From a beef cattle grazing perspective, most interest these days is in 30 to 60 per cent alfalfa grown in a blend with grass forages and/or in combination with other legume species.

“We’ve looked at alfalfa in several different grazing studies over the years, most often used in a binary mix (alfalfa/grass forage blends),” says Bart Lardner, formerly research scientist at the Western Beef Development Centre, now a professor in the Department of Animal and Poultry Science at the University of Saskatchewan. “And the alfalfa component produces several benefits. The industry has lost a lot of money over the years by avoiding alfalfa, partly due to unwarranted fear.”

Photo by Chris Knight

Timing is one of the keys to reducing the risk of bloat, says Lardner. In high percentage alfalfa stands avoid grazing alfalfa before and up to the bud stage, when plants can be lush and tender. And avoid introducing cattle to an alfalfa pasture when the dew is heavy or while it is raining. As plants mature and develop more fibre, the risk of bloat greatly decreases as the stand reaches 30 to 40 per cent flower stage. And including alfalfa in a pasture forage mix that includes more fibrous grasses also provides cattle with a wider feed selection than just straight alfalfa. “It may take some experience for people to find their comfort level for grazing alfalfa, but it is an excellent forage,” he says. “Yearlings will gain nicely on alfalfa with no comparison to a grazing straight grass.”

Alfalfa grazing management tips:

1. Never turn hungry livestock into a pasture containing a high proportion of bloat-causing plants.

2. Fill animals with dry hay or grass pasture before beginning to graze high bloat-potential pastures.

3. Avoid turning animals onto fresh, high bloat-potential pasture that is moist with dew, rain, or irrigation water. Both rate of intake and initial rate of digestion are higher from moist plants, causing more rapid initial digestion.

4. Never allow animals grazing high bloat-potential pasture to get so hungry that they consume too much in one feeding. Always have sufficient feed available.

5. Make paddock rotations mid-day or later to help minimize moisture and increase plant carbohydrate concentration.

6. Avoid dramatic changes in forage quality when rotating from paddock to paddock by leaving adequate residue.

7. Observe livestock closely the first several days and remove any “chronic-bloating” animals.

8. Avoid grazing legumes before they begin to bloom. Make closer observations for bloat when many plants are at a younger growth stage.

9. Manage grazing to encourage livestock to consume low- or non-bloating plants and plant parts (such as an alfalfa/grass forage blend) rather than just succulent top growth. For example, use daily strip grazing or use high stock density in multiple paddock systems rather than continuous stocking.

10. Once grazing begins, don’t remove animals from pasture or make frequent, major changes in the type of pasture being grazed unless animals have greatly distended rumens. Mild bloat is common on high bloat-potential pastures. Frequent diet changes prevent rumen microbes and animals from adapting to bloat pastures.

11. Be extra observant for cattle bloat when high bloat plants show a rapid flush of growth such as during cloudy, wet periods in the spring and after a plant stress event such as hail or drought.

12. Delay grazing high bloat-potential plants for three to five days after freeze damage.

13. Avoid grazing alfalfa stands in September as plants need adequate carbohydrate reserves for overwintering. Can graze above ground biomass after final fall killing frost.

14. Graze with animals that have smaller rumen capacities, like yearlings and calves, rather than mature cows.

15. Talk to your veterinarian about the advisability of using a product like Alfasure (mix with water to prevent frothy bloat). (In the U.S. look for Bloatguard. Here’s information on dosage.)

What Varieties and Mixes Work Best?

Lardner says a legume/grass pasture blend that includes about 30 to 40 per cent alfalfa makes excellent pasture for grazing cow-calf pairs. “It provides good quality forage for the nursing and gestating beef cow, and can help increase weaning weights on calves,” he says. “And the legume is also helping to fix nitrogen in the soil.” For backgrounding cattle or for grass finished animals, studies show a pasture with a 50/50 blend of alfalfa and grass species can generally produce 1.5 to 2 pounds per day or more weight gains.

Lardner says studies over the years have involved several alfalfa varieties with some differences in production, but all performed well. AC Grazeland BR, for example, is a bloat-reduced variety that showed reduced yield compared to conventional alfalfa varieties in some projects, but still had adequate quality for beef cattle. Spredor 4, a grazing-type, fall-dormant variety with some yellow flowering, also worked well in cow/calf pasture trials.

A newer variety PS3006, is a creeping-rooted variety used in grazing trials comparing different forage legumes and grasses in the blend. And AC Yellowhead, an older yellow-flower Siberian variety, was another one used in blends along with other forage legumes and grasses.

Creeping rooted alfalfa varieties generally survive for long periods of time, but management has a significant impact on their longevity. Cultivars of creeping root varieties have varying levels of winter hardiness and disease resistance, higher yields in dry weather, salinity tolerance, and tolerate soil pH as low as 6.2. Tap-root type alfalfa tend to perform better in wetter areas than creeping root.

Photo by Ryan Boyd

“One of the neat things about alfalfa is that there are so many varieties — some with purple flowers and others with yellow — which have tremendous potential for adaptability to Canadian growing conditions,” says Lardner. “Many varieties have tremendous tolerance of high pH soils and salinity with good production.”

These are all Canada specific varieties. Check with seed-providers in your area for ideas about what will work best in your environment.

We got these recommendations from Kings Agriseeds:

Traffic Pro Alfalfa – Traffic Pro is a traffic tolerant, deep set crowned alfalfa. The deep set crown helps protect the plant from wheel and animal damage as well as providing additional winter protection during conditions with lack of snow cover. Good aphanomyces resistance.

Performance Max – An alfalfa and endophyte free tall fescue mixture that will excel in both agronomic and nutritional performance. The alfalfa adds drought productivity, protein, and high NSC. The tall fescue adds consistent high fiber digestibility, superb yields, traffic tolerance and wet soil tolerance.

Lardner says a new research project is starting this year looking at the performance of forage species developed to grow in saline soils. Halo alfalfa, registered in 2013, is one of the newest varieties. It followed the salt tolerant Bridgeview alfalfa registered in 2011. And among grass species, AC Saltlander, a green wheatgrass, was registered in 2004. While it is difficult to predict weather cycles, Lardner says with wetter years followed by some dryer growing seasons, soil salinity is a concern in many areas. Farmers are interested in forage legumes and grass species that can return saline soils to productivity and help control weeds.

Lardner says over the years they have also compared alfalfa and other forage legumes in blends with various grass species. They compared PS3006 alfalfa in forage blends against cicer milkvetch and AC Glenview sainfoin blended with hybrid meadow brome grass.

And in another project it was AC Yellowhead alfalfa and AC Mountain View sainfoin blended with Russian wild rye and hybrid meadow brome grass.

Lardner says there were no runaway standout performances among the legumes — they all performed quite well, although growing conditions can be a factor.  For example, in one project comparing an alfalfa/grass blend with a sainfoin/grass blend at two different growing sites, the sainfoin/ hybrid bromegrass or alfalfa/hybrid bromegrass pastures out yielded the alfalfa/Russian wild rye or sainfoin/Russian wild rye pastures in a grazing trial near Lanigan, in central Saskatchewan, under good growing conditions. At Swift Current in southern Saskatchewan, under drier conditions, the same two legume/grass blends performed about equally.

As might be expected, the forage yield and rates of gains on yearlings at the Lanigan site were between 10 to 15 per cent higher than at the Swift Current site. Moisture was the main contributing factor.

And on that point, he referred to a three-year study in southern Saskatchewan, with data still being analyzed, where they looked at including alfalfa in a pasture mix to help fill that late summer/early fall period where grasses can run out of steam due to dry growing conditions — grass growth slows down or stops and quality can decline without moisture. “It is difficult to run a pasture program anywhere on only two or three inches of moisture,” says Lardner. “But alfalfa with deeper tap roots can go down and reach the moisture and still be fairly productive. We are still analyzing the numbers on this project, but we are happy with the results from the first two years. With good performance on the alfalfa it may have a role in carrying pastures and cattle through that late summer period.”

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Kathy Voth
Kathy Voth
I am the founder, editor and publisher of On Pasture, now retired. My career spanned 40 years of finding creative solutions to problems, and sharing ideas with people that encouraged them to work together and try new things. From figuring out how to teach livestock to eat weeds, to teaching range management to high schoolers, outdoor ed graduation camping trips with fifty 6th graders at a time, building firebreaks with a 130-goat herd, developing the signs and interpretation for the Storm King Fourteen Memorial trail, receiving the Conservation Service Award for my work building the 150-mile mountain bike trail from Grand Junction, Colorado to Moab, Utah...well, the list is long so I'll stop with, I've had a great time and I'm very grateful.


  1. This is a great article describing how to graze high alfalfa pastures safely. The techniques discussed work very well. However, the article does not consider palatability. At one time in my grazing career I was a huge proponent of grazing alfalfa. Since most of our leased land was former hay land, we had a lot of alfalfa to deal with, grazing sheep, cow/calf & yearlings. We were certainly able to achieve better gains than on straight grass. The problem, though, is that to get good production from an alfalfa/grass stand, the animals will graze the grass hard before they move onto the alfalfa. Once I noticed what was happening, I did a taste test on the lower leaves of the alfalfa. They are bitter to the taste which explains why livestock would rather eat something else. In fact, if you follow sheep & cattle through a high alfalfa paddock, you will see them biting just the tops off. This will happen throughout the entire paddock!
    To maintain production & build a healthy forage stand, I moved to introducing red clover to my pastures. In fact, my Cree name is Tommy Red In the last four years I have also experienced grazing alsike clover & cicer milkvetch with great results. The thing with clovers & cicer milkvetch is that animals find the plants palatable and in my experience, gain as well as grazing alfalfa. Since animals find these legumes tasty, they graze them the same way they do grass. By having an even graze between grass & legume, production is maintained without compromising soil & pasture health. Further, I have yet to have an animal bloat on clover. Not so with alfalfa (sad face).
    Side note: Bart Lardner has done some very creative and useful research and worth following what he is up to!

    • Great info, Tom! Thanks!

      About that taste test…what tastes bad to us isn’t necessarily a sign that it tastes bad to animals. Palatability is more a matter of the nutrients and toxins in the plant and what the animal needs. It’s a discovery your friend Fred Provenza made in the last couple decades that hasn’t really gotten out there. Still, I’ve tested things for taste too. Imagine my disappointment when what was promoted as an “ice cream plant” for cattle, didn’t taste like ice cream at all. 🙂

      • Point taken Kathy. If it isn’t bitterness, though, I’m not sure why livestock prefer eating other things before the lower leaves of alfalfa. In fact the manager of research farm in the US told me he felt alfalfa was a huge failure when it came to grazing. I don’t remember his name, but he mentioned it when we were discussing the nutritional value of pig weed.

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